Viitaten Lovelacen testin kommenttiosastolla käytyyn äo vs. elämässä menestyminen keskusteluun, seuraava lainaus sisältää mielenkiintoista tietoa:
How strong is the correlation between IQ and occupation? From the GATB data, Jensen (1980b: 343) estimated that 47 percent of the variance in IQ was within occupations, thus implying a correlation of .69 between IQ and occupational classification. Gottfredson (1997: 87-88) reports that the median standard deviation of scores of job applicants on the Wonderlic Personnel Test is 6.3 within occupations, while the standard deviation on that test in the entire working population is 7.6. This would imply a correlation between test score and occupation of .56. However, Gottfredson (p. 90) extends her argument to a comparison of variation in IQ among job incumbents - not applicants - within occupations and in the general population - not just workers. Her discussion implies that the variance of IQ among workers within occupations is only 25 to 33 percent as large as in the general population; that is, 67 to 75 percent of the variance in IQ occurs between occupations.